display all user names on login

how can i enable displaying of computer user names on login? I changed all passwords of all users, including the administrative password, but the administrator is still the default user which logs in automatically.

The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Compnet Ventures, LLC hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.